摘要
预测疲劳裂纹形成方法认为寿命取决于特定数值的应力或应变历程。疲劳裂纹形成寿命可定义为产生一定尺寸裂纹所需的循环次数。材料疲劳强度试验预测部件疲劳寿命的难点在于所施加的应力和应变本质上通常是多轴的,单轴拉伸疲劳和能量释放速率在这方面的应用价值是有限的。按照研究的目的,可简单地评估不同材料的相对疲劳性能,作为包括长期老化影响在内的总体测试项目的一部分。对于部件寿命预测,在工作环境条件下应尽可能用实际大小或按比例缩小的模型进行。
The prediction method of fatigue crack formation considers that the life depends on the stress or strain history of a particular value.The fatigue crack initiation life can be defined as the number of cycles required to produce a certain size crack.The difficulty in predicting fatigue life of components is that the applied stresses and strains are usually multiaxial in essence,and the application value of uniaxial tensile fatigue and energy release rate is limited in this respect.According to the purpose of the study,the relative fatigue properties of different materials can be simply evaluated as part of the overall test project,including long-term aging impact.For the life prediction of components,the actual size or scaled model should be used as much as possible under the working environment.
作者
黄元昌
Huang Yuanchang(National Rubber and Plastic Machinery Information Center, Beijing 100143, China)
出处
《橡塑技术与装备》
CAS
2017年第24期33-38,共6页
China Rubber/Plastics Technology and Equipment
关键词
测试
疲劳裂纹
疲劳寿命
处理方法
testing
fatigue crack
fatigue life
treatment method
